Small in size but output brightness will up to 150 yard when powered by 14500 battery.(It uses batteries, but it doesn't include batteries.) Skid-proof & water resistant design. It can be used in rainy days (but can't put it into water). Adjustable focus range for different usage. Stretch it to adjust its focus. Comes with a clip for convenience. Working voltage is wide and can utilize the batteries in the largest extent. The strobe mode can make you get noticed when you need help in an emergency. Perfect for cycling, hiking, fishing, camping and other outdoor activities.